Denver School of Science and Technology (DSST)

Submitted by Doug NØMM on Thu, 02/20/2025 - 22:13

This is one 3000g and one 1500g balloon, or three 1500g balloons, carrying student-built payloads for Denver School of Science and Technology's CubeSat program.

Payload Plans: 

EOSS-376 Lite Rev A

EOSS-377 Heavy Rev A

Predictions are shown at www.eoss.org/predict. Scroll to the correct date and launch site.

The EOSS participation form is available here: https://forms.office.com/r/snfR16fC72 . The summary spreadsheet is available here: EOSS Flight Day  _May 10th, 2025.xlsx and will be available to you (sync'd to the submitted forms) if you are signed in to your EOSS Teams account.

Flight Coordinator: 
Doug Leber NØMM
Event Date: 
Saturday, May 10, 2025 - 00:00 to 23:45
Alt Launch Date: 
Sunday, May 11, 2025
Launch Site: 
Deer Trail
Flights: 

EOSS-376 Lite

Balloon Type: 
Kaymont 1500g Latex
Parachute: 
12 Ft Rocketman. Release Charlie
Beacons: 
FrequencyCallsignTypeNotes
145.710KC0D-3APRS/ DF/ Release
144.340AE0SS-12APRS/. DIGI LiteAlias EOSSA (letter'o') Time slot 0:27 and 0:57
Payload Plan: 
PDF icon EOSS-376 Lite Rev A 23 APR.pdf

EOSS-377 Heavy

Balloon Type: 
Kaymont 3000g Latex
Parachute: 
12 ft Rocketman with release Baker
Beacons: 
FrequencyCallsignTypeNotes
144.905KC0D-1Remote Release/DF
144.340AE0SS-3APRS/DIGIAlias "AEØSS" Time slots: 0:20 and 0:50
Payload Plan: 
PDF icon EOSS-377 Heavy Rev A.pdf
FrequencyList: 

EOSS Preflight Net @ 7 PM Mountain Time the preceding night:

 

The preflight net is hosted on the Fun Machine linked system https://www.we0fun.com/  

EchoLink *CANONCTY* conference and on the TGIF DMR Network Node: 1997 Talkgroup 815

Denver area Frequencies: 

    • 449.225 MHz (-5 MHz Offset, 141.3 Hz CTCSS) Mt Thorodin
    • 448.150 MHz (-5 MHz Offset, 141.3 Hz CTCSS) DIA
    • 449.975 Mhz (-5 MHz Offset, 100 Hz CTCSS) Westcreek
    • 447.525 MHz (-5 MHz Offset, 146.2 Hz CTCSS) Devils Head   

Back up Pre Flight Net Frequincies

        • 146.940 MHz (-600 KHz Offset, 103.5 Hz CTCSS) Rocky Mountain Radio League (RMRL) Repeater if the RMHAM machine is down
        • 146.640 MHz (-600 KHz Offset, 100.0 Hz CTCSS) Denver Radio League (DRL) Repeater will serve as a backup to the backup repeater 

Flight Day:
Launch Site:
        • 446.050 MHz Simplex  
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Track & Recovery Operations:
        Repeaters:
        • 449.450 MHz (-5 MHz Offset, 103.5 Hz Tone) RMRL repeater

        Simplex Frequencies:
        • 446.100 MHz Balloon #1 Field Simplex 
        • 446.150 MHz Balloon #2 Field Simplex
        • 446.200 MHz Balloon #3 Field Simplex
        • 446.275 MHz Car to Car drive out Simplex
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Digital Mobile Radio (DMR):

The decision as to which talkgroup use will be made by the EOSS RF Coordinator on a per flight basis.

  • Rocky Mountain Wide Network – Talk Group 700 - Rocky Mountain Ham Radio has approval to the use "Wide" for flight operations.
  • Central Colorado Regional Network – Talk Group 720 - On occasion, EOSS may use the Central Colorado Regional Network (Talk Group 720).

        Legacy 2M Simplex Frequency (not generally used due to desense/interference issues with the 2M APRS packets)
        • 146.550 MHz Simplex

2M Direction Finding Frequencies:

  • 144.340
  • 144.360
  • 144.905
  • 145.535
  • 145.645
  • 145.710
  • 145.765

 

Tactical Calls: 
TacticalCall SignNameNotes
Live Flight Tracking: 

To view live flight tracking, navigate to https://track.eoss.org